NOISSUE Rough refactor of ProfilePatch and VersionFile internals.

They are now distinct classes with distinct responsibilities.

* ProfilePatch is an entry in MinecraftProfile and can hold VersionFile or Meta::Version.
* VersionFile is the basic element that holds version information loaded from JSON.
* Meta::Version is the loader class for VersionFile(s) from a server.

api/logic/ProblemProvider.h

@@ -0,0 +1,54 @@
+#pragma once
+
+enum class ProblemSeverity
+{
+	None,
+	Warning,
+	Error
+};
+
+class PatchProblem
+{
+public:
+	PatchProblem(ProblemSeverity severity, const QString & description)
+	{
+		m_severity = severity;
+		m_description = description;
+	}
+	const QString & getDescription() const
+	{
+		return m_description;
+	}
+	const ProblemSeverity getSeverity() const
+	{
+		return m_severity;
+	}
+private:
+	ProblemSeverity m_severity;
+	QString m_description;
+};
+
+class ProblemProvider
+{
+public:
+	virtual const QList<PatchProblem>& getProblems()
+	{
+		return m_problems;
+	}
+	virtual void addProblem(ProblemSeverity severity, const QString &description)
+	{
+		if(severity > m_problemSeverity)
+		{
+			m_problemSeverity = severity;
+		}
+		m_problems.append(PatchProblem(severity, description));
+	}
+	virtual ProblemSeverity getProblemSeverity()
+	{
+		return m_problemSeverity;
+	}
+
+private:
+	QList<PatchProblem> m_problems;
+	ProblemSeverity m_problemSeverity = ProblemSeverity::None;
+};